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Operating Leases - Summary of Total Lease and Operating Expenses (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Leases [Abstract]        
Lease and operating expenses $ 238,014 $ 235,272 $ 732,318 $ 700,926